JPS628395Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields This proposal relates to an efficient Wesco pump.

(b) Prior Art As shown in FIG. 1, a Wesco pump generally houses a disc-shaped impeller 4 in a pump casing 3 consisting of a front casing 1 and a back casing 2. A large number of blades 5, 5, . , a shaft sealing chamber 7 is formed in the center, a rotating shaft 8 is coupled to the impeller 4 in the shaft sealing chamber, and a shaft sealing device 9 for preventing water leakage is provided. Reference numeral 10 denotes an annular partition between the annular water passage 6 and the shaft sealing chamber 7, and a part 11 of the partition
protrudes in the radial direction and blocks the water inlet 12 and the outlet 13, which are located adjacent to each other, from each other so as not to short-circuit.

In such a configuration, when the impeller 4 is rotated, water is sucked into the annular passageway 6 through the water intake port 12, this water is pressurized while making a circuit inside the passageway 6, and is discharged from the discharge port 13. Ru. However, when the suction height of this pump is high, the degree of vacuum on the water suction port 12 side increases, and the degree of vacuum in the shaft sealing chamber 7 also increases accordingly. As a result, air is sucked into the shaft sealing chamber 7 through the shaft sealing device 9, so that the shaft sealing device 9 is exposed to the air and its durability is significantly reduced. As a preventive measure, conventionally, the partition section 10 near the discharge port 13
, a passage 1 communicating between the annular water passage 6 and the shaft sealing chamber 7;
There are 4. As a result, a portion of the high-pressure water near the discharge port 13 enters the shaft sealing chamber 7 through the passage 14, so that the pressure inside this shaft sealing chamber becomes high, thereby causing the shaft sealing chamber 7 to increase in pressure. This prevents air from being sucked inside.

However, when the suction height is low or when the faucet is closed, the pressure near the discharge port 13 becomes extremely high, and the amount of water flowing into the shaft sealing chamber 7 through the passage 14 becomes extremely high. This results in a decrease in pump performance.

(c) Purpose of the invention This proposal secures the minimum amount of water flowing into the shaft sealing chamber to prevent deterioration of the shaft sealing device, but also to ensure that water does not flow into the shaft sealing chamber more than necessary and degrade performance. It is intended to be.

(d) Structure and operation of the device Therefore, the present invention provides a pressure valve in the passage communicating between the annular water passage and the shaft sealing chamber, and closes this pressure valve when the pressure in the annular water passage exceeds a certain value. This prevents water from flowing into the shaft sealing chamber more than necessary. Therefore, even if the pressure valve is closed,
When the water pressure in the annular water passage is high, water gradually flows into the shaft sealing chamber through the gap between the partition of the pump casing and the impeller, so the degree of vacuum in this shaft sealing chamber does not become very high, and the shaft sealing device There is no air inhaled from the

(E) Embodiment FIG. 3 shows an embodiment of the present invention, in which the annular partition 10 between the annular water passage 6 and the shaft sealing chamber 7 has a discharge port 1.
A passage 14 is provided near 3 to communicate between the annular water passage 6 and the shaft sealing chamber 7. A pressure valve 15 is provided in this passage 14, and this pressure valve is mounted on a valve seat 16 formed on the peripheral wall of the passage 14.
a ball 17 that approaches and separates from the valve seat 1;
6, and a spring 18 that biases it in a direction away from 6. Reference numeral 19 denotes a stopper for preventing the ball 17 from protruding into the annular passageway 6.

In the above configuration, when the suction height of the pump is high, the water pressure in the annular water passage 6 does not increase so much, so the ball 17 forming the pressure valve is pushed to the valve seat by the force of the spring 18. 16 so that the passageway 14 is open. As a result, a part of the water in the annular water passage 6 enters the shaft sealing chamber 7 through this passage 14, and in order to prevent the pressure in this shaft sealing chamber from becoming too low, it passes through the shaft sealing device 9 into the shaft sealing chamber 7. Air does not enter the sealed chamber 7.

In addition, when the suction height is low or when the faucet is used with the faucet closed, the water pressure in the annular passageway 6 increases, causing the ball 17 to move against the valve seat 1 against the spring 18.
6 to close the passage 14. As a result, a large amount of water in the annular water passage 6 does not flow into the shaft sealing chamber 7 through the passage 14, so that pump performance does not deteriorate. However, since the water pressure in the annular water passage 6 is high, the partition part 10 and the impeller 4
Water flows into the shaft sealing chamber 7 through the gap between the shaft sealing chamber 7 and the shaft sealing chamber 7.
Maintain appropriate pressure inside. Therefore, in this case too,
Air is not sucked into the shaft sealing chamber 7 through the shaft sealing device 9.

(f) Effect As described above, in this proposal, a pressure valve is provided in the passage between the annular water passage and the shaft sealing chamber, and the passage is closed when the water pressure in the annular water passage is high. Even if the top height is low or the faucet is closed, the pump performance will not deteriorate, and regardless of the suction height, air will be sucked into the shaft sealing device to seal the shaft. There is no possibility of deterioration of the device.

In addition, the water pressure in the shaft sealing chamber can be adjusted with high precision with a simple configuration that only includes one passageway and a pressure valve.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of a conventional Wesco pump.
Figure 2 is a vertical sectional view of the pump casing, Figure 3
The figure is a longitudinal sectional view of the pump casing used in the proposed Wesco pump. 4... Impeller, 3... Pump casing, 6
...Annular water passage, 7...Shaft sealing chamber, 13...Discharge port, 14...Passage, 15...Pressure valve.

Claims (1)

[Scope of utility model registration request] In a pump casing housing an impeller, an annular passage is formed along the periphery of the impeller, and a shaft sealing chamber is formed in the center. A passage communicating between the water channel and the shaft sealing chamber is provided, and within the passage,
The Wesco pump is provided with a pressure valve that closes when the water pressure on the discharge port side reaches a predetermined value or higher.